JPS6218775B2 - - Google Patents
Info
- Publication number
- JPS6218775B2 JPS6218775B2 JP11519582A JP11519582A JPS6218775B2 JP S6218775 B2 JPS6218775 B2 JP S6218775B2 JP 11519582 A JP11519582 A JP 11519582A JP 11519582 A JP11519582 A JP 11519582A JP S6218775 B2 JPS6218775 B2 JP S6218775B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- rod
- damping force
- gap
- oil chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000013016 damping Methods 0.000 claims description 18
- 239000011553 magnetic fluid Substances 0.000 claims description 12
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Description
【発明の詳細な説明】
本発明はピストンの伸縮動作に伴つて、その流
速に抵抗を与えて減衰力を発生させる油圧緩衝器
において、減衰力の大きさを外部から任意に調整
し得る減衰力調整装置を備えた油圧緩衝器に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hydraulic shock absorber that generates a damping force by resisting the flow velocity of a piston as the piston expands and contracts. The present invention relates to a hydraulic shock absorber with an adjustment device.
従来、この種の油圧緩衝器において、減衰力の
大きさを任意に調整するためには減衰弁を設けて
外部から調整するようにしているが、複雑な機構
と多数の部品を使用しなければならなかつた。 Conventionally, in this type of hydraulic shock absorber, in order to arbitrarily adjust the magnitude of the damping force, a damping valve is installed and the adjustment is made from the outside, but this method requires the use of a complicated mechanism and a large number of parts. It didn't happen.
本発明は、このような従来の問題点を基本的に
変えるもので、簡単でしかも確実に作用する装置
を提供せんとするものである。以下本発明の一実
施例を図面により詳細に説明する。 The present invention fundamentally changes these conventional problems and seeks to provide a simple yet reliable device. An embodiment of the present invention will be described in detail below with reference to the drawings.
第１図は本発明減衰力調整装置の一実施例を示
す断面図である。図において、１は中空のピスト
ンロツド２の先端に嵌装したピストン３を、内部
に磁性流体を封入したダンパーケース４内に摺動
自在に嵌合しピストンロツド２の植設基部５とダ
ンパーケース４間にコイルばね６を張架してなる
油圧緩衝器で、ピストン３に設けた油孔７，８及
び弁機構９，１０により圧縮行程、伸長行程の減
衰力を得るようにしてある。 FIG. 1 is a sectional view showing an embodiment of the damping force adjusting device of the present invention. In the figure, a piston 3 fitted to the tip of a hollow piston rod 2 is slidably fitted into a damper case 4 in which a magnetic fluid is sealed, and a piston 3 is inserted between the implanted base 5 of the piston rod 2 and the damper case 4. This hydraulic shock absorber is made up of a coil spring 6 stretched over the piston 3, and is designed to obtain damping force during the compression stroke and extension stroke through oil holes 7 and 8 provided in the piston 3 and valve mechanisms 9 and 10.
一方、ダンパーケース４内の上部中央より突出
せしめたロツド１１を前記ピストンロツド２の中
空部２ａ内に挿入し、ピストン３の一部に縮径段
部３ａを設けてロツド１１と縮径段部３ａの間に
適当な隙間１２を通してダンパーケース４、ピス
トン３、ロツド１１間に磁気回路を形成せしめ
る。そして、この磁気回路の一部例えばロツド１
１に電磁コイル１３を設けておく。また、ピスト
ンロツド２に設けた油孔１４と前記隙間１２を介
してダンパーケース４の下部油室Ａから上部油室
Ｂに連通する油路を設けたものである。なお１５
は別置のタンクで、ダイアフラム１５ａを介して
油室Ｃと気体室Ｄとに区画され、油室Ｃはダンパ
ーケース４の上部油室Ｂと可撓性パイプ１６で連
絡せしめてピストンロツド２の伸縮によりダンパ
ーケース４内の体積の変化分に対する油の吸収及
び排出を行なわせる。また油圧緩衝器１の油中に
は磁性体を混合せしめた磁性流体が封入される。 On the other hand, the rod 11 protruding from the center of the upper part of the damper case 4 is inserted into the hollow part 2a of the piston rod 2, and a diameter-reducing step 3a is provided in a part of the piston 3, and the rod 11 and the diameter-reducing step 3a are connected to each other. A magnetic circuit is formed between the damper case 4, the piston 3, and the rod 11 through an appropriate gap 12 between them. A part of this magnetic circuit, for example, rod 1
1 is provided with an electromagnetic coil 13. Further, an oil passage is provided which communicates from the lower oil chamber A to the upper oil chamber B of the damper case 4 via the oil hole 14 provided in the piston rod 2 and the gap 12. Note 15
is a separate tank, which is divided into an oil chamber C and a gas chamber D via a diaphragm 15a, and the oil chamber C is connected to the upper oil chamber B of the damper case 4 through a flexible pipe 16 to allow the expansion and contraction of the piston rod 2. Accordingly, oil is absorbed and discharged according to the change in volume within the damper case 4. Further, a magnetic fluid mixed with a magnetic material is sealed in the oil of the hydraulic shock absorber 1.
次に、その動作を説明する。 Next, its operation will be explained.
緩衝器の圧縮行程時、油室Ｂ内が圧縮されて高
圧となるが、一部はタンク１５の油室Ｃに吸収さ
れる。しかしピストンロツド２の中空部２ａ内に
ロツド１１が侵入するので中空部２ａ内がより高
圧となり、磁性流体は中空部２ａ内より隙間１２
を通つて油室Ｂに流れ込むと同時に弁機構１０は
油室Ｂの内圧により座着し、そのため、油室Ｂの
磁性流体は油孔７より弁機構（コンプレツシヨン
バルブ）９を押し開いて下部油室Ａに流れ、両者
で緩衝作用が行なわれる。 During the compression stroke of the shock absorber, the inside of the oil chamber B is compressed and becomes high pressure, but a portion of the pressure is absorbed into the oil chamber C of the tank 15. However, since the rod 11 enters into the hollow part 2a of the piston rod 2, the pressure inside the hollow part 2a becomes higher, and the magnetic fluid flows into the gap 12 from the inside of the hollow part 2a.
At the same time as the magnetic fluid flows into the oil chamber B through the oil chamber B, the valve mechanism 10 is seated due to the internal pressure of the oil chamber B. Therefore, the magnetic fluid in the oil chamber B pushes the valve mechanism (compression valve) 9 open from the oil hole 7. It flows into the lower oil chamber A, and a buffering effect is performed between the two.
この場合、電磁コイル１３に外部より通電して
おくと通電の大きさにより隙間１２における磁界
の強さが増加し、したがつて隙間１２に流れる磁
性流体の粘度も増加し、減衰力も大きくなる。即
ち減衰力を調整することができる。 In this case, if the electromagnetic coil 13 is energized from the outside, the strength of the magnetic field in the gap 12 will increase depending on the magnitude of the energization, and therefore the viscosity of the magnetic fluid flowing in the gap 12 will also increase, and the damping force will also increase. That is, the damping force can be adjusted.
一方、伸長行程時には、反対に油室Ｂ内が負圧
になり、一部はタンク１５の油室Ｃから補充され
るが、中空部２ａ内よりロツド１１が引き抜かれ
るため中空部２ａ内がより負圧となる。したがつ
て、油室Ｂ内の磁性流体が隙間１２を通つて中空
部２ａ内に流れ込むと同時に油室Ａ内の磁性流体
も油孔１４より中空部２ａ内に流れる。一方、弁
機構９はダンパーケース４の下部油室Ａの内圧に
より座着するので、油室Ａの磁性流体は油孔８よ
り弁機構１０を押し開いて上部油室Ｂに流れ、両
者で緩衝作用が行なわれる。したがつて圧縮行程
と同じく減衰力を調整することができる。 On the other hand, during the extension stroke, the pressure inside the oil chamber B becomes negative, and some of the oil is replenished from the oil chamber C of the tank 15, but since the rod 11 is pulled out from the inside of the hollow section 2a, the inside of the hollow section 2a becomes more Negative pressure results. Therefore, at the same time that the magnetic fluid in the oil chamber B flows into the hollow portion 2a through the gap 12, the magnetic fluid in the oil chamber A also flows into the hollow portion 2a through the oil hole 14. On the other hand, the valve mechanism 9 is seated by the internal pressure in the lower oil chamber A of the damper case 4, so the magnetic fluid in the oil chamber A pushes open the valve mechanism 10 through the oil hole 8 and flows into the upper oil chamber B, and the two are buffered. action is taken. Therefore, the damping force can be adjusted in the same way as the compression stroke.
その動作特性を横軸にピストン速度、縦軸の上
方に伸張時の減衰力、下方に圧縮時の減衰力で示
すと第２図のとおりとなる。但し、ｍ，m′は無
電流の場合、ｎ，n′は一定の電流を流した場合の
特性曲線である。勿論ピストン３の摺動により磁
気回路の磁路長が変化するので磁気抵抗が変化
し、これにより位置依存の減衰力可変が可能にも
なる。またロツド１１をテーパー状にすることに
よりピストン３の位置における磁気抵抗を変化さ
せ、同じく位置の減衰力可変も可能である。 The operating characteristics are shown in Fig. 2, with the horizontal axis representing the piston speed, the vertical axis representing the damping force during extension, and the vertical axis representing the damping force during compression. However, m and m' are characteristic curves when no current flows, and n and n' are characteristic curves when a constant current flows. Of course, the sliding of the piston 3 changes the magnetic path length of the magnetic circuit, so the magnetic resistance changes, and this also makes it possible to vary the damping force depending on the position. Further, by making the rod 11 tapered, the magnetic resistance at the position of the piston 3 can be changed, and the damping force at the position can also be varied.
以上詳細に説明したように、本発明によれば極
めて簡単な構成で、しかも確実に減衰力を外部よ
り調整できる効果がある。 As described above in detail, the present invention has an extremely simple configuration and has the effect of being able to reliably adjust the damping force from the outside.
第１図は本発明油圧緩衝器における減衰力調整
装置の一実施例を示す断面図、第２図は同じくそ
の減衰力の特性曲線を示す図である。
１……油圧緩衝器、２……ピストンロツド、２
ａ……中空部、３……ピストン、３ａ……縮径段
部、４……ダンパーケース、６……コイルばね、
７，８……油孔、９，１０……弁機構、１１……
ロツド、１２……隙間、１３……電磁コイル、１
４……油孔、１５……タンク、Ａ，Ｂ，Ｃ……油
室、Ｄ……気体室。
FIG. 1 is a sectional view showing an embodiment of a damping force adjusting device in a hydraulic shock absorber of the present invention, and FIG. 2 is a diagram showing a characteristic curve of the damping force. 1...Hydraulic shock absorber, 2...Piston rod, 2
a...Hollow part, 3...Piston, 3a...Reduced diameter step part, 4...Damper case, 6...Coil spring,
7, 8... Oil hole, 9, 10... Valve mechanism, 11...
Rod, 12... Gap, 13... Electromagnetic coil, 1
4... Oil hole, 15... Tank, A, B, C... Oil chamber, D... Gas chamber.
Claims (1)
時に減衰力を発生する弁機構を備えたピストン
を、磁性流体を封入したダンパーケース内に摺動
自在に嵌装し、一方、ダンパーケース内に突出せ
しめたロツドを前記ピストンロツドの中空部に挿
入し、かつピストンの一部に縮径段部を設けてロ
ツドと縮径段部間に適当な隙間を設けダンパーケ
ース、ピストン、ロツド間に磁気回路を形成し、
かつその一部に電磁コイルを設けると共にピスト
ンロツドに設けた油孔と前記隙間を介してダンパ
ーケースの下部油室から上部油室に連通する油路
を設け、前記ピストン部とロツド間の隙間の磁界
の強さを電磁コイルに通電する電流によつて変化
せしめて隙間に流れる磁性流体の粘度を変化させ
ることによつて減衰力を可変せしめることを特徴
とする油圧緩衝器における減衰力調整装置。1. A piston equipped with a valve mechanism that generates a damping force during expansion and compression at the tip of a hollow piston rod is slidably fitted into a damper case filled with magnetic fluid, while protruding into the damper case. The rod is inserted into the hollow part of the piston rod, and a diameter-reducing step is provided in a part of the piston, and an appropriate gap is created between the rod and the diameter-reducing step to form a magnetic circuit between the damper case, the piston, and the rod. ,
In addition, an electromagnetic coil is provided in a part of the piston rod, and an oil passage is provided that communicates from the lower oil chamber of the damper case to the upper oil chamber via the oil hole provided in the piston rod and the gap, and the magnetic field in the gap between the piston part and the rod is 1. A damping force adjustment device for a hydraulic shock absorber, characterized in that the damping force is varied by changing the strength of the magnetic fluid by changing the viscosity of a magnetic fluid flowing through a gap by changing the strength of the current flowing through an electromagnetic coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11519582A JPS596446A (en) | 1982-07-02 | 1982-07-02 | Damping force adjustment device in hydraulic shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11519582A JPS596446A (en) | 1982-07-02 | 1982-07-02 | Damping force adjustment device in hydraulic shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596446A JPS596446A (en) | 1984-01-13 |
| JPS6218775B2 true JPS6218775B2 (en) | 1987-04-24 |
Family
ID=14656705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11519582A Granted JPS596446A (en) | 1982-07-02 | 1982-07-02 | Damping force adjustment device in hydraulic shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596446A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59184008A (en) * | 1983-03-31 | 1984-10-19 | Nhk Spring Co Ltd | Rolling stock suspender |
| CN102588498A (en) * | 2012-02-20 | 2012-07-18 | 东南大学 | No-leakage electromagnetic fluid body damper |
| KR101305874B1 (en) * | 2012-04-18 | 2013-09-09 | 양동호 | Vibration absorber with variable stiffness |
| CN102927191A (en) * | 2012-10-25 | 2013-02-13 | 中国民航大学 | Coil internally-installed type magnetorheological damper with oil needle |
-
1982
- 1982-07-02 JP JP11519582A patent/JPS596446A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS596446A (en) | 1984-01-13 |
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